An instance of spinning 180 degrees, so that one is facing in the opposite direction.
The friendly welcome was a 180 from what she had been expecting
The exact opposite.
A complete change of direction or opinion.
A turning away from a straight course.
Change in the form of a word (morphologic change) to express different grammatical categories.
Diffraction.
Any form produced by such an instance of a change, such as the principal parts for any given stem: any of the declined or conjugated forms that constitute its declension or conjugation.
An affix representing such an instance.
A change in curvature from concave to convex or from convex to concave.
A change in pitch or tone of voice.
An instance of such change.